It was caused by missing view events remove notifications when replacing
ongoing ECalClientView. The previously known (ViewData::lost_components)
were not notified as removed, thus made incorrect counts in the mini-calendar.
Implements an ECalDataModel object from evolution courtesy of Milan Crha
ECalDataModel hides the details of events retrieving from
calendars. Provides a time range and a subscriber system allowing
objects implements the necessary callbacks to be notified of events
happening on the selected time range.